Chain-grip and clevis.



J. W. DAVIS. 01mm GRIP AND GLEVIS. APPLICATION IILED'00T.10, 190a.

Pgtent ed Apr. 27 1909. I

UNITED STATES PATENT onnien;

JOSEPH W. DAVIS, OF CONCORDIA, K.AI\SAS.

CHAIN-GRIP AND CLEVIS.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed October 10, 1908. Serial No. 457,176.

To all Whom it may concern:

Be it known that I, Josnrn-W. DAVIS', acitizen of the United States, residing at'Concordia, in the county of Cloud and State of Kansas, have invented a new and useful* out in the appended claims, it being understood that divers changes in the form, proportions, size and minor'details of the structure-may be'made within the scope of theclaims, without departing from the spirit or sacrificing any of the advantages of the invention.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawmgs.

In the accompanying drawings, Figure 1 is a perspective of my invention; Fig. 2 is a bottom plan thereof, parts of the ring 11 being broken away better to illustrate the structure; Fig. 3 is alongitudinal section on the line'AB of Fig. 2; Fi 4 is a longitudinal section. of a modified form of clamping member; Fig. 5 is a bottom plan of the detail shownin Fig. 4.

In carrying out my invention, I provide a'U-shaped body member 1-, having near its upper end, a transversely disposed brace 2,

and being provided at its upper end with aswivel which may take the form of the hook 4. An annular member 3 is fashioned integral with the lower ends of the body memwith elementaliydisposed channels S' -placed about ninety degrees from the points where' the body member 1 merges into thev 'annular membcr'3;

The clamping member comprises jaws 62 having a conoidal outer face 8arranged'to register with the inner conoida-l face 7 of the member 3 the jaws 6 being slidably mounted in the member 3. The jawsfi-have straight cooperating faces 9, and the outer surface'S- bears outstanding ribs '10 arranged to regis ter in the-channels 5, and disposed about ninety degrees from the faces 9. These rib's 10 do not extend 'to the bottom or the jaws-6',

and between their lower ends and the lower end of the jaws 6 is disposed a ring 11, die metrically split as shown at 12, the splitting plane being substantially at right, angles to the faces 9 of the jaws 6. Upon each side of assing' through the split ring 11 and entering the lower ends of the jaws 6, the apertures in the split 12 are located pivots 13 the ends of the jaws arranged for the reception of the ends of the pivots 13 being of such a size as to allow the jaws 6 to have slight pivotal movement in the ring 11. v The pivots 13 preferably comprise a threaded portion 23 arranged to engage the ring 11, and a smooth terminal 24 arranged to engage the jaws 6. The upper faces ofthe ends of the split ring 11 are arranged to engage the lower ends of the ribs 10, as show-n in,Fig. 1. The ring 11 is of such a diameter that it will engage the bottom of the member 3 when the jaws 6 are slid upward within said member 3.

The clamping member is provided with an axial chamber 14 in its bottom, terminating at its upper portion in a reduced or domelike terminal 15. The upper end of the clamping member has a cruciform axial opening 16, communicatlng with the chamber 14 as shown in Fig. 3; the airial chamber 1 1 and "thecruciform opening 16 bein symmetrically disposed with respect= to the plane or the faces 9 of the-jaws 6. This cruciform opening consists of a longer portion17 symmetrically divided by the-plane of the faces'9, anda shorter portion 18'; disposed at right anglesto the portion 17 the ends of the portion 18- extending into the jaws 6.1

In Figs; 4 and'5 Ihave shown a modified form of'clamping member in which the jaws 19 are adapted to engage -arope, instead ot'a chain, as shown in Figs. 1, 2 and 3. The cruciform opening of "Figs. 1, 2 and 3'is replaced with a-ciroular opening 20, lravinginwithin the annular member 3, separating the faces 9, the ribs it), moving in the channels 5, serving to guide the jaws 6 in their upward movement. As the jaws 6 open, they pivot upon the members 1-3 in the ring 1 1, the ring '11 being split at 12 each of the portions thereof have a slightmovement upon the members 13 which prevents the jaws 6 from binding in their pivotal movement. This pivotal movement should be but slight, and the lower ends of the ribs 10, engaging the ends of the split ring 11 at 12, serve to keep the portions of the ring 11 in position and to prevent extreme movement: in the ring 11. The ring 11, engaging the lower face of the annular member'ii, prevents the jaws 6 from passing upward out of the ring 3.

When the chain 22 is introduced into the chamber 14, the end of the chain will be guided by the reduced terminal 15 into the cruciform opening 16. The jaws 6 are then pushed downward into the position shown in Fig. l, the portion 18 of the cruciform opening 16 engaging one of the links of the chain 22, as shown in Fig. 3.

When it is desired to free the chain 22 from theaction of tlie jaws 6, the jaws 6 are shoved upward, whereupon the said chain 22 will be freed.v The lateral movement of the jaws (5 is in the hne AB of Fig. 2, hence the portion 18 ot the cruciform opening 16 is made shorter and the gripping action is imposed upon it, but since the jaws 6 have no lateral movement at right angles to the line A--B, the portion 17 of the cruciform opening 16 is made of such a length that the chain may readily move through it at all times, the portion 17 having no part in the gripping action.

It will be seen that when the chain 22 is drawn upon, the jaws 6 will be held together,

the bearingof the faces 9 upon each otherincreasing with the pull upon the chain 22, theconoidal, cooperating faces 7 and 8 forcing the jaws 6 together.

The device is of wide application; it may be used in logging operationsdfcnce building, and in all work where a firm yet easily adjustable grip upon a chain or rope is called for. j

In the following claims, I have employed the Word 'elementally to describe the position of the channels 5 in the annular member 3, and, since the use of the above mentioned. term, unaccompanied by explanation, may tend to make my claims vague and uncertain, I consider it proper to state that the conoidal bore or inner face of the nnular member 3 may be considered to be generated by an inclined straight line moving in a circular orbit,

the position of this line at any instant being denominated an element of the surface so generated.

What is claimed is:-

1. in a device of the class described, an annular member having a conoidal inner face and being provided with channels clemcntally disposed therein; slidably mounted in the annular member, cooperating jaws having a conoidal outer surface arranged to register with the inner face of the annular member; ribs outstanding from the jaws and arranged to register with the channels in the annular member; a ring pivotally attached to the lower ends of the jaws and arranged to engage the lower face of the annular member.

In a device of the class described, an annular member having a conoidal inner face; slidably mounted in the annular member, cooperating jaws having a conoidal outer surface arranged to register with the inner face of the annular member; a ring pivotally attached to the lower ends of the jaws and arranged to engage the lower face of the annular member.

3. In a device of the class described, a ring; a clamping member comprising a pair of jaws having straight inner cooperating faces and being pivoted in the ring for movement at right angles to the plane of the inner faces, the said clamping member having a cruciform axial opening symmetrically disposed with respect to the plane of the inner faces of the jaws, the said opening comprising a longer portion longitudinally divided by the plane of the jaw faces, and a shorter portion transversely divided by said plane. {4. In a device of the class described, a

' c amping member comprising a pair of jaws having straight inner cooperating faces, the /said clamping member having in its bottom an axial chamber with a reduced upper terminal, and being provided in its top with an axial, cruciform opening conmmmcating with the axial chamber, the axial chamber and the cruciform opening being disposed the inner faces of the jaws.

5. 111 a device of the class described, an annular member having a conoidal inner face; slidably mounted in the annular member, jaws having straight inner cooperating faces and being provided with a conoidal outer surface arranged to register with the inner face of the annular member; a ring diametrically split and pivoted to the lower end of the jaws upon each side of the openings thus formed, the splitting plane being substmitially at right angles to the plane of tho i:. -.:r faces of the jaws, and the ring being arrai'iged to engage the lower face of the annular member.

ti, In a device of the class described, an annular member having clementally dissymmetrically with respect. to the plane of Posed channels in, its inner face; a pair of Y in testimonfi ghet Iclaimthe foregoing es .egoperating jaws slidably mounted in the my qwn, I have hereto affixed mysigr ature ianiiulai' megiber; ribs; carrfiadhbyhthe jlaws in thepre seriee of tivo witnesses. ram arrange to register Wit t ee anne sin. the annular member; a. diametrically split JOSEPHW' ring pivoted to the lower end of the jaws, the Witnesses: upper faces of the ends of the s lit ring being 1 R A. Snow,- ammnged'to'etigslge the ends 0 the ribs. I E. C. WHITCHER. 

